METALOGENIA DE ORO Y COBRE EN AMÉRICA CENTRAL
Gold and copper deposits in Central America are hosted by island arc volcanic rocks of Late Cre-taceous and younger age. Low potassium tholeiitic basalts form the base of the volcanic pile and were deposited in an intraoceanic island arc. Volcanism became more potassic with time, and by Late Miocene...
Published in: | Revista Geológica de América Central |
---|---|
Main Authors: | , |
Format: | Other/Unknown Material |
Language: | Spanish |
Published: |
Universidad de Costa Rica
2016
|
Subjects: | |
Online Access: | https://hdl.handle.net/10669/22640 http://revistas.ucr.ac.cr/index.php/geologica/article/view/8578 https://doi.org/10.15517/rgac.v0i23.8578 |
id |
ftunivcostarica:oai:https://www.kerwa.ucr.ac.cr:10669/22640 |
---|---|
record_format |
openpolar |
spelling |
ftunivcostarica:oai:https://www.kerwa.ucr.ac.cr:10669/22640 2023-05-15T16:00:26+02:00 METALOGENIA DE ORO Y COBRE EN AMÉRICA CENTRAL Metalogenia de oro y cobre en América central Nelson, Carlos E. Nietzen, Fernando 2016-05-03T14:25:36Z application/pdf https://hdl.handle.net/10669/22640 http://revistas.ucr.ac.cr/index.php/geologica/article/view/8578 https://doi.org/10.15517/rgac.v0i23.8578 spa spa Universidad de Costa Rica Revista Geológica de América Central; http://revistas.ucr.ac.cr/index.php/geologica/article/view/8578 doi:10.15517/rgac.v0i23.8578 https://hdl.handle.net/10669/22640 Copyright (c) 2014 Revista Geológica de América Central Revista Geológica de América Central; Revista Geológica de América Central: Número 23 2215-261X 0256-7024 artículo científico 2016 ftunivcostarica https://doi.org/10.15517/rgac.v0i23.8578 2022-10-30T05:39:29Z Gold and copper deposits in Central America are hosted by island arc volcanic rocks of Late Cre-taceous and younger age. Low potassium tholeiitic basalts form the base of the volcanic pile and were deposited in an intraoceanic island arc. Volcanism became more potassic with time, and by Late Miocene time, calc-alkaline andesites dominate the volcanic rock record. Alkaline volcanic rocks appeared about five million yearsago but are underreported in older portions of the arc.Porphyry copper deposits are centered on calc-alkaline plutons of intermediate (quartz diorite to quartz monzo-nite) composition and are typically anomalous in gold. Although some of the porphyry deposits contain in ex-cess of a billion tonnes, none are in production. Bonanza gold veins cluster around sub-volcanic intrusions indistricts which mimic the spacing of active volcanoes. Precious metal bonanzas, a number of which producedin excess of a billion ounces of gold, are responsible for the bulk of historic gold production in Central America. Hot spring gold deposits are being discovered along a regional unconformity which marks the emergence ofthe present-day island arc from the ocean. Although discovered only recently, some of these deposits already exceed a million ounces. Host rocks include exogenous domes and surrounding pyroclastic aprons.Exploration efforts today focus on bulk-mineable deposits: porphyry-related stockworks, skarns, and epithermalstockworks and disseminated deposits. Regional strike-slip faults parallel to the Nicaraguan depression controlthe distribution of both gold and copper throughout Central America. Age dates provide documentation for mi-neralization throughout the history of the arc, a period of close to 100 million years. Los depósitos de oro y cobre en América Central se encuentran dentro de rocas del Cretácico Tardío y más jóvenes del arco insular volcánico. Basaltos toleíticos bajos en potasio forman la base de la agrupa-ción volcánica y fueron depositados en un arco insular intraoceánico. El vulcanismo ... Other/Unknown Material Day Island Universidad de Costa Rica: Repositorio Kérwá Bajos ENVELOPE(-56.317,-56.317,-63.467,-63.467) Bonanza ENVELOPE(-119.820,-119.820,55.917,55.917) Rocas ENVELOPE(-56.948,-56.948,-63.398,-63.398) Revista Geológica de América Central 23 |
institution |
Open Polar |
collection |
Universidad de Costa Rica: Repositorio Kérwá |
op_collection_id |
ftunivcostarica |
language |
Spanish |
description |
Gold and copper deposits in Central America are hosted by island arc volcanic rocks of Late Cre-taceous and younger age. Low potassium tholeiitic basalts form the base of the volcanic pile and were deposited in an intraoceanic island arc. Volcanism became more potassic with time, and by Late Miocene time, calc-alkaline andesites dominate the volcanic rock record. Alkaline volcanic rocks appeared about five million yearsago but are underreported in older portions of the arc.Porphyry copper deposits are centered on calc-alkaline plutons of intermediate (quartz diorite to quartz monzo-nite) composition and are typically anomalous in gold. Although some of the porphyry deposits contain in ex-cess of a billion tonnes, none are in production. Bonanza gold veins cluster around sub-volcanic intrusions indistricts which mimic the spacing of active volcanoes. Precious metal bonanzas, a number of which producedin excess of a billion ounces of gold, are responsible for the bulk of historic gold production in Central America. Hot spring gold deposits are being discovered along a regional unconformity which marks the emergence ofthe present-day island arc from the ocean. Although discovered only recently, some of these deposits already exceed a million ounces. Host rocks include exogenous domes and surrounding pyroclastic aprons.Exploration efforts today focus on bulk-mineable deposits: porphyry-related stockworks, skarns, and epithermalstockworks and disseminated deposits. Regional strike-slip faults parallel to the Nicaraguan depression controlthe distribution of both gold and copper throughout Central America. Age dates provide documentation for mi-neralization throughout the history of the arc, a period of close to 100 million years. Los depósitos de oro y cobre en América Central se encuentran dentro de rocas del Cretácico Tardío y más jóvenes del arco insular volcánico. Basaltos toleíticos bajos en potasio forman la base de la agrupa-ción volcánica y fueron depositados en un arco insular intraoceánico. El vulcanismo ... |
format |
Other/Unknown Material |
author |
Nelson, Carlos E. Nietzen, Fernando |
spellingShingle |
Nelson, Carlos E. Nietzen, Fernando METALOGENIA DE ORO Y COBRE EN AMÉRICA CENTRAL |
author_facet |
Nelson, Carlos E. Nietzen, Fernando |
author_sort |
Nelson, Carlos E. |
title |
METALOGENIA DE ORO Y COBRE EN AMÉRICA CENTRAL |
title_short |
METALOGENIA DE ORO Y COBRE EN AMÉRICA CENTRAL |
title_full |
METALOGENIA DE ORO Y COBRE EN AMÉRICA CENTRAL |
title_fullStr |
METALOGENIA DE ORO Y COBRE EN AMÉRICA CENTRAL |
title_full_unstemmed |
METALOGENIA DE ORO Y COBRE EN AMÉRICA CENTRAL |
title_sort |
metalogenia de oro y cobre en américa central |
publisher |
Universidad de Costa Rica |
publishDate |
2016 |
url |
https://hdl.handle.net/10669/22640 http://revistas.ucr.ac.cr/index.php/geologica/article/view/8578 https://doi.org/10.15517/rgac.v0i23.8578 |
long_lat |
ENVELOPE(-56.317,-56.317,-63.467,-63.467) ENVELOPE(-119.820,-119.820,55.917,55.917) ENVELOPE(-56.948,-56.948,-63.398,-63.398) |
geographic |
Bajos Bonanza Rocas |
geographic_facet |
Bajos Bonanza Rocas |
genre |
Day Island |
genre_facet |
Day Island |
op_source |
Revista Geológica de América Central; Revista Geológica de América Central: Número 23 2215-261X 0256-7024 |
op_relation |
Revista Geológica de América Central; http://revistas.ucr.ac.cr/index.php/geologica/article/view/8578 doi:10.15517/rgac.v0i23.8578 https://hdl.handle.net/10669/22640 |
op_rights |
Copyright (c) 2014 Revista Geológica de América Central |
op_doi |
https://doi.org/10.15517/rgac.v0i23.8578 |
container_title |
Revista Geológica de América Central |
container_issue |
23 |
_version_ |
1766396407367860224 |